Composition for joining strips of motion-picture films



. des isfactory: xylene blue; alphazurine acid Patented Nov. 6, 1928;

mgotzz UNITED STATES PATENT .QFFICEL OTTO W. COOK, OF ROCHESTER, NEW YORK,

ASSIGNOR TO EASTMAN KODAK COMPANY,

OF ROCHESTER, NEW YORK, A. CORPORATION OF NEW YORK.

COMPOSITION FOR JOINING STRIPS OF MOTION-PICTURE FKLMS.

No Drawing. Application filed May 6,

My invention relates to film cements or liquid film solvent compositions such as are used in splicing together lengths of motion picture film. I p

" 6 In handling such film in the photographic dark room, particularly where long lengths l of film are' run through a continuous processing machine, it is necessary to join lengths l of film and to repair breaks by subdued- 16 light of restricted wave length, usually in the red or orange portion of the spectrum. -When using the ordinary cements of liquid film solvent compositions which are substantially colorless it is impossible to tell by s ght just where they have been applied. I have, therefore, improved the filmsolvent composition or cement by adding thereto a small quantity of a dye that is absorptive of light of thewave lengths used. For reg- 20 ular dark room use, that is, for red light conditions such as are employed in handling negative film and orange. light conditions such as are used in handling positive film, Lhave found any of the following satgreen B; malachite green; toluidine blue; methylene green B and methylene blue. The above are the commercial names of dyes that are well-known, and are given with the chemical structural names in the 1924 Color lndexof the Society of Dyers and Colorists.

' The dyes enumerated are spirit soluble and must he soluble in the film solvent composi- I tion or cement used. The particular proportion of dye is relatively unimportant. While a very small amount only is necessary, more than is re- 1925i Serial No. 28,508.

' the dye chosen is in solution in the composition. Among themost common are amylacetate or acetone or mlxtures 'of these with or without some scra film in solut1on.-

Having thus descri ed my invention, what I claimas new and desire to secure by Let-' ters Patent is: w

1. The method of rendering visible under light of wave lengths in the red and orange portions of thespectrum a liquid composition used in joining strips of photographic 00 I film that comprises adding thereto a dye absorptive of light of such wave lengths.

2. A liquid composition of low viscosity for use in joining strips of motion picture filmund'er red and orange light usual in 66 photographic dark room conditions and con:

taining a solvent for the film and, in solution therein, a dye that is absorptive of light waves predominantly in the red and orange portions of the spectrum.

Signed at Roc ester, New York, this 2nd day'ofMay, 1925.

o'rro w. 000K 

